Adding a parameter to CSV output on PS

Hi everyone, I have the following script:

$PWDtest = 'P@$$w0rd!'
function Test-ADCredential {
    [CmdletBinding()]
    Param
    (
        [string]$UserName,
        [string]$Password
    )
    if (!($UserName) -or !($Password)) {
        Write-Warning 'Test-ADCredential: Please specify both user name and password'
    } else {
        Add-Type -AssemblyName System.DirectoryServices.AccountManagement
        $DS = New-Object System.DirectoryServices.AccountManagement.PrincipalContext('domain')
        $DS.ValidateCredentials($UserName, $Password)
    }
}



Get-User -ResultSize Unlimited | % {
    If(Test-ADCredential -UserName $_.SamAccountName -Password $PWDtest){
        $_ | Select SamAccountName,WindowsEmailAddress
        }
    } | Export-Csv C:\Results.csv

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What this script does is fairly simple, it runs on all the users in my domain, and tried to validate each user with the password specified in $PWDtest and throws all the successful hits into a CSV file.

It was built as part of a security Audit I once ran. I now need to run on another domain, but the leaving sysadmin told me that there are several problematic passwords that they used to use... I want to use on the new domain, but I'd like for the $PWDtest value to appear in the CSV as well and not only the username and the email... How can I achieve that?